Samsung's flagship phone, the Galaxy S8. Released in April 2017.

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phone will not come on, shows triangle and will not charge x2

Sooo I have and S8 and S8+ doing screen repair on both. Now the phones will not come on, they only show triangle's and will not charge. I know this was an issue with the thermostat on S4's many years ago and had to change the charge port. I am not sure what needs to be done to fix this issue. I have a new cable and charge port on order but was not for sure if any one else has had this issue.

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Did you completely reassemble the phone before trying to charge and power it on? With previous Galaxy S series phone generations I can and often do test the phones before reassembling the midframe. But I found that with the S8 and probably likewise with the S8+ that you need to fully assemble the phone first. On one of my first S8 repairs I found that without the midframe on I got an error that looked to be like the battery thermostat triangle error experienced in previous models. But when I put the midframe on, the problem was resolved. Apparently, some contacts must be made to complete a circuit. Hopefully, that is all that you are experiencing in your situation.

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